If the AT&T Worldnet Accelerator stops after few seconds, navigate to Start > Control Panel > Uninstall a program, select the utility from the list, click Uninstall and follow the on-screen instructions. After that, reboot your computer, run a registry cleaner from Software Informer database to make sure that there are no leftover registry keys in your system and install the Accelerator again. If it doesn’t work, you will need to contact the support team.